Track membranes: principles and...
Transcript of Track membranes: principles and...
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Development of novel type of track etch membranes for gas separation process
by
Olushola Rotimi ADENIYI
Supervisors: Prof. L. Petrik
(University of the Western Cape) Prof. A. Nechaev Prof. P. Yu. Apel
(Flerov Laboratory of Nuclear Reactions)
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Outline
• Acknowledgement
• Introduction
• Objective
• Experimental approach
Results (preliminary)
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Introduction
• Heavy ion irradiation on polymeric membranes
• Advanced technology in the fabrication of well-defined pore geometry on polymer films
• Some of the uses of track-etched membrane includes; microfiltration, ultrafiltration of water, biological fluids, gas media filtration etc
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Objective
• To investigate effects of latent tracks on polymers and their gas selectivity and permeability properties
• Adopt a robust approach in the development
of flat sheet track etched polymer membrane for gas selectivity and permeability studies
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Experimental approach
Metal deposition
Substrate functionalization
Penetrant gas
Permeate
Retentate
GC
Membrane
Membrane cell Thermostat
Gas permeability measurement
a. Xe +126 (1.5 MeV)
b. chemical etching (time, concentration etc)
Choice deposition technique ( i.e. electroless plating)
Investigate deposition parameters and their
direct effect on adhesion, film thickness,
uniformity etc
Fig. 1 Schematics of gas permeability reactor
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Experimental Approach in development of flat gas separation polymeric membranes
Native PET film (23mcm) Xe irradiated PET film
Xe irradiated with Al foil11mcm/PET film
1M NaOH etching under various time 3, 6, 9 and 12 minutes
Gas permeability and selectivity studies
Xe 126 ion
Xe 126 ion
Using polyethylene terephathalate (PET) films as a model
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/
/
i
c VQ
Sp c c
V - gas is carrier flow rate, m3/s; S - membrane area, m2; p is atmospheric pressure, Pa; ci - penetrant concentration in upstream, vol. %, с/ - penetrant concentration in downstream, vol. %.; D- dense layer thickness
P = Q d ,
,j
i
j
iij
P
P
Q
Q
Gas Permeability
Permeability coefficient
Ideal selectivity
Gas permeability parameters
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Gas permeability studies
Sample P, cm cm3/cm2 s cm Hg
Не СО2 СН4
PETF 1,0E-10 1,2E-11 1,3E-12
PETF 1 (Хе+126,E-1,5 MeV/W) 1,1E-10 1,4E-11 1,4E-12
PETF 2 (Хе+126,E-1,5 MeV/W, Al-foil) 1,1E-10 1,6E-11 1,5E-12
Sample α
Не/СО2 Не/СН4 CO2/CH4
PETF 8,7 80 9,2
PETF 1 (Хе+126,E-1,5 MeV/W) 8,1 79 10
PETF 2 (Хе+26,E-1,5 MeV/W, Al-foil, 6,7 73 10
Table 1 Gas permeability of PETF films irradiated by Xe+126
Table 2 Gas selectivity of PETF films irradiated by Xe+126
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Fig. 2 The dependence of gas permeability on time of etching for irradiated PETF films
Fig. 3. The dependence of ideal gas selectivity on time of etching for irradiated PETF films
1,0E-10
1,0E-09
1,0E-08
1,0E-07
1,0E-06
1,0E-05
0 5 10 15
Pe
rme
abili
ty, c
m3
/ cm
2 s
cm
Hg
Etching time, min
He
CO2
CH4
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12
Sele
ctiv
ity
Etching time, min
He/CH4
CO2/CH4
Study of influence of time of etching on PETF gas permeability properties
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Surface morphological studies (SEM)
a b
c
d e
1M NaOH track-etched PET films at different etching time: (a) 0, (b) 3, (c) 6, (d) 9 and (e) 12 minutes
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Fig. 1. SEM cross-section 9 minutes track-etched PET
Estimation of influence of time of etching on thickness of dense layer
Fig. 2. SEM cross-section 12 minutes track-etched PET
Time of
etching, min
d, m
He CO2 CH4
0 20 20 20
3 10 11 10
6 9 10 6
9 4 4 0,8
12 0,3 0,1 0,1
Calculated thickness of dense layer
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IR results
500 650 800 950 1100 1250 1400 1550 1700 1850 2000
% T
1102
972
Wavenumber (cm-1)
1625
1587
1458
1397
1378
1181
689
634
a
b
c
d e
851
1959
PET structure
KEY:
Etching time
(a) 0, (b) 3, (c) 6, (d) 9 and (e) 12 minutes
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Future work
• Irradiate polymethylpentene (PMP) and PI polymers under similar condition as PET
• Conduct gas permeability and selectivity measurement PMP and PI
• Compare results with PET gas permeability and selectivity data
• Adapt membrane for hydrogen gas permeability and selectivity
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Acknowledgement
DST (South Africa) NRF (South Africa) UC JINR (Russia) FLEROV LABORATORY (Russia) 7th SA-JINR Coordinators Colleagues
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спасибо